because the ability to change the fullscreen with a resolution change will be implemented post release 2.0
i have the choice, or wait until it is implemented, or use the fullscreen option as it is now and "calculate/resize" all my images...
but my application is multi lingual and i don't want the user to break out of the program like this..

Your best bet for getting some information on this from the JFX dev team and also potentially getting them to work on it is by raising an issue in JIRA. The dev team may or may not read these posts here.

I would agree with Michael that this is a (small) security concern, but by signing a jar it should be able to get permission to run without this message (unsigned apps should probably be restricted to showing the message).

I would also agree that at a minimum the message needs to support internationalization in code.

You may want to include these comments in your JIRA issue if you find them relevant to you.

We found a crutch that allows to decrease time for suppressing the message "press escape to exit fullscreen"
We create rectangle in stackpane above all other elements. Then we redraw it with FadeTransition.

Just wanted to comment here that not all apps written in JavaFX are gonna be running from a browser. The one I'm working on is a normal desktop app, and having this message shown when my app goes fullscreen is silly -- same goes for being able to press escape.